dev-api: add developer portal, OpenAPI spec, and Flatenbadet case study

- New /developers/ page with API docs, SDKs, pricing, use cases
- OpenAPI 3.0 spec for Orders, Missions, Photos, Analytics
- Case study: Glasskiosken i Flatenbadet — complete ROI analysis
- Updated /order/ with recurring missions and frequency dropdown

services/frilans-payout/node_modules/siginfo/index.js

@@ -0,0 +1,20 @@
+module.exports = function (query, force) {
+  var isAttached = false
+  if (process.stderr.isTTY || force === true) {
+    isAttached = true
+    process.on('SIGINFO', onsiginfo)
+    process.on('SIGUSR1', onsiginfo)
+  }
+
+  return function () {
+    if (isAttached === true) {
+      process.removeListener('SIGINFO', onsiginfo)
+      process.removeListener('SIGUSR1', onsiginfo)
+      isAttached = false
+    }
+  }
+
+  function onsiginfo () {
+    query()
+  }
+}